Elastic fluid turbine plant



Jan. 23, 1940. A. R. SMITH 2,133,194

ELASTIC FLUID TURBINE PLANT Filed May 26, 1958 FigJ.

I Inventor: Arthur R. Smith,

y His Attorney.

Patented Jan. 23, 1940 PATENT OFFICE ELASTIC FLUID TURBINE PLANT ArthurR. Smith, Schenectady, N. Y., assignor to General Electric Company, acorporation of New York Application May 26, 1938, Serial No. 210,203

2 Claims.

The present invention relates to elastic fluid turbine plants in whichan extraction stage or stages of a turbine or turbines are connected toa heater such as a feed water preheater to sup- 5 ply heating mediumthereto. More particularly the invention relates to the kind of plantsin which double flow turbines are provided with intermediate stageextraction conduits for supplying heating fluid to a heater.

The object of my invention is to provide an improved construction andarrangement of power plants of the type above specified;

For a consideration of what I believe to be novel and my invention,attention is directed to the following description and the claimsappended thereto in connection with the accompanying drawing.

In the drawing Fig. 1 illustrates a sectional view of a power plantarrangement embodying my invention, and Fig. 2 is a view partly insection along line 2-2 of Fig. 1.

The arrangement comprises a high pressure turbine l and a double flowlow pressure turbine l l mechanically coupled with the high pressureturbine Ill and arranged to receive elastic fluid exhausted from thelatter by means including a cross-over conduit i2. The double flowturbine has two halves, one half having turbine wheels l3, l4 and i5 andthe other half having turbine wheels l6, I1 and I8. Each half includes anozzle diaphragm ahead of each turbine wheel and supported on a casingIS. The fluid discharged from the last turbine wheels [5 and I8respectively of the two halves is conducted through an exhaust casing orhood 20 to a condenser 2| to be condensed therein. The generalarrangement so far described is more fully set forth in the patent toOscar Junggren, deceased, No. 2,102,416, issued December 14, 1937, andassigned to the same assignee as the present application.

The arrangement includes a heater utilizing extraction fluid from thedouble flow turbine and disposed in accordance with my invention in thedead space of the double flow exhaust casing, that is, in that portionof the exhaust casing through which ordinarily little exhaust elasticfluid flows on its passage to the condenser. The heater thus provided insaid dead space is preferably connected to intermediate stages of bothhalves of the double flow turbine to assure equal flow of elastic fluidthrough said halves. In the present example I have shown two seriesconnected heaters 22 and 23 for preheating liquid 55 such as feed waterto be supplied to a boiler.

The heaters have drums located in a central portion of an extension 24of the exhaust casing 20. The heaters project through the extendedexhaust casing and are supported on the walls thereof. Each heater hasfront and rear headers 5 25 and 23 respectively connected by banks oftubes 21 with a dividing wall 28 in the front header 25. Fluid to bepreheated is conducted by a conduit 29 to the heater 23 and dischargedtherefrom through a conduit 3|] connecting the header of the heater 23in series with the header of the heater 22 so that fluid to be heated issuccessively passed through the heating passages formed by the heaters23 and 22 and discharged into a conduit 3i connected to the front headerof the heater 22. Heating fluid is conducted to the drum of the heater22 by a conduit 32 which has two branches 33 and 34 respectivelyconnected to extraction stages of the two halves of the double flowturbine. The branch 33 in the present instance receives fluid dischargedfrom the bucket wheel l3 and the branch 34 receives fluid dischargedfrom the bucket wheel I6. From another viewpoint, two higher stages ofthe two halves of the double flow turbine have parallelconnectedextraction conduits 33, 34 to supply equal amounts of heating fluid tothe heating drum of the heater 22. Heating fluid is conducted to thedrum of the heater 23 by a plurality of conduits 35 and 36, the conduits35 being connected to receive fluid discharged from the second stage,that is, from the turbine wheel [4 of one turbine half and the conduits36 being connected to receive fluid discharged from the second stage,that is, from the turbine wheel [1 of the other turbine half. Thus thedrum 23 receives substantially equal amounts of heating fluid from thesecond stage of each of the two turbine halves.

The heating fluid supplied by conduit 32 to the drum of the heater 22 isdischarged therefrom through conduits 31 into the drum 23 and theheating fluid supplied through conduits 35, 36 and 31 to the drum of theheater 23 is discharged therefrom through an opening or conduit 38 intothe condenser 2|.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. The combination of a double flow turbine having two halves eachforming a plurality of stages and an exhaust casing surrounding the twohalves and having an extension for receiving exhaust fluid from the twohalves, a surface type heat exchanger including a drum supported on theextension and located in the dead space thereof at right angle to theaxis of the turbine, and conduit means for conducting equal amounts ofheating fluid from intermediate stages of both halves to the heatexchanger.

2. The combination of a double flow turbine having two halves with aplurality of stages in each half and an exhaust casing surrounding thetwo halves and receiving fluid exhausted from the last stages of thehalves, a preheater comm prising two series connected drums supported onARTHUR E. SMITH.

